teddykiller1

I have a 98 STi V4, it decided yesterday to run on 3 cylinders instead of 4

i checked the sparks and discovered no spark from number 4, did all checks and narrowed it down to no spark from the coil pack on number 4.

Today i fitted a new coil pack, and still have then same problem, number 4 does not spark.

I want to Cry!!!!!!

help any 1

briforbes

Have you switched over the HT leads to see if that's what's causing the problem?

teddykiller1

yes mate, i used a spare spark plug and tried it through the leads, and even switched then over

briforbes

Was the coil pack new or 2nd hand? Do you know someone else who has an impreza you can borrow the coil pack from to see if theirs works on yours?

teddykiller1

coil pack is a new one off Howard at HDC , . Suppose all i can do is call out green flag, let em mess, then tell me they cant fix it, then take it to a garage


God Hates me!

and my car!

Slowboy Racing

Are you sure there is no problem with the lead and the cap is correctly fitted to the plug can sometimes be a simple thing missed.

The coil pack fires 3&4 spark together so assuming cylinder three has a spark the chances are the coil pack is fine.

teddykiller1

well what i did to find out was i pluged number 4 into a spark plug and laid it on my engin bay and fired car up, and there was no spark, so i did same with number 3 and it did spark, so then i put lead no 4 on 3 and it still sparked, so now i am confused!

Yamarashi

I think there's a bit of confusion going on here. I believe Uni Link is talking about the single coil pack with HT leads whereas teddykiller seems to have the single coil packs that go onto each plug and therefore have no HT leads so I also assume there would be no wasted spark arrangement as per the single coilpack/ HT setup.

Anyway I could be wrong with the above but assuming its the case I would think that there is a problem with the wiring leading to the plug that the coil pack is actually pluged into. Teddykiller has shown that the coil packs are all OK so it must be the connecting wiring to that particular cylinder at fault.

Slowboy Racing

98 STi V4 Single coil pack not coils, or not that i have ever seen.


But as said you do need to check the wiring back to the source, which in this case is the ecu. Assuming you do have the single coil pack then there should be 3 wires connecting this to the engine loom then to the block connectors by the battery. Also check your ecu connections are sitting tight.

Cylinders 3&4 are fired from the same output on the ecu which is why I assumed if three was firing you have a good connection and the coil is in good order?

Slowboy Racing

What was the outcome on this?

Yamarashi

Did you make sure that the metal of the spark plug body was touching earth in each case?

If you have the single coil setup it tends to be the HT leads that break down and as UN-INK points out the feed to this triggers the sparking of 3 and 4 together so if one works so should the other. You'd be very unlucky to have the same issue on two coils! and so it seems to point to HT lead or Plug.

I guess we'll wait and see what Greenflag have to say

Scott.T

iTrader: (2)

There may be an ignitor behind the bracket where the boost control solenoid sits. I know it's there for Pre96, not sure on 97/98 though.